I don't ever remember a time in my life that I did not believe the Bible to be the Word of God. That is because I was blessed to have a grandmother that loved the Lord and lived for the Lord. It was easy for me to believe, but what about the people that did not have that foundation? Trying to convince them to open the Bible and start reading (the Holy Spirit will do the rest) can be a tough challenge.
I recently watched a YouTube sermon by Voddie Baucham Jr. and he was explaining why he chooses to believe the Bible. He said "In the Bible, we have a reliable collection of historical documents written by eyewitnesses during the lifetime of other eyewitnesses. They report super natural events that took place in fulfillment of specific prophecy. The writings are divine rather than human in origin." He is right. Scientists have tried to disprove the Bible for centuries without any success. Some people will also argue that the Bible has been interpreted so many times that it has lost it's original meaning. Really? The Bible has been interpreted several times but always from the original Hebrew, Aramaic and Greek texts, not from the last interpretation.
Think about this....when Jesus was being crucified, He cried out " ELI, ELI, LAMA SABACHTHANI?" that is "MY GOD, MY GOD, WHY HAVE YOU FORSAKEN ME?" (Matthew 27:46). Jesus was referring to the writings of David in Psalm 22. When David wrote Psalm 22, there was no such thing as crucifixion. That method of torture had never been used or even been thought of yet. David wrote that Psalm 1,000 years before Christ's crucifixion. Now, go and read Psalm 22. It is prophecy of what Jesus was going through on the cross.
God wants us to know who He is. That is why He has given us His word....the Bible.